Combat knife



FIG. 1 is a top plan view of a combat knife showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a left end view thereof; and

FIG. 4 is a right end elevational view thereof.

The side elevational view and the bottom plan view not shown are similarto the side elevational view shown and the top plan view shown,respectively.

The ornamental design for a combat knife, as shown and described.